Air purification device and method

ABSTRACT

The present invention is an air purification method and device. Due to the lower airflow resistance that the present invention induces, an exhaust fan or blower with motor of lower torque is adopted. Consequently, the whole air purification is operated at a lower noise level. Lower operational voltage is applicable for the high-voltage electrostatic precipitator device and provides a similar or superior performance and effectiveness for dust removal. The air purification device/system is designed with higher flexibility and of more compact in dimension and size. Dust is removed from the environment by a high voltage electrostatic precipitator. The airflow stream within a high-voltage electrostatic precipitator is such that the direction of the path of the airflow is changed at least twice.

FIELD OF THE INVENTION

This invention concerns an intelligent apparatus for air purification.

TECHNICAL BACKGROUND

The air pollutants exist in two major physical phases: particle phasepollutants and gaseous phase pollutants. The particle phase pollutantsare pollutants with significant physical sizes including dust particles,airborne bacteria and mold. They may be composed and be bound togetherby different matters with different compositions. The gaseous phasepollutants are pollutants with simple chemical structures. The size ofthe gaseous phase pollutants are small from angstrom to nano-scale.

There are many methods to eliminate the particle phase pollutants orpollutants with significant physical sizes. Conventionally, aHigh-Efficiency Particulate Arresting filter (HEPA filter) is used tofiltrate particulate matter from the polluted air. On another hand, somemay utilize a high-voltage to produce an electrostatic effect for dustremoval. Some may release negative ion to the ambient, which eventuallycharges up the dust particulate, and allows them be collected in someregions which are relatively neutral or positively charged.

The efficiency and performance of using HEPA filter for dust removal isalways better than that of the dust removal by the ionization or by theelectrostatic precipitation methods. Nevertheless, the HEPA filter is aconsumable item and cannot be recycled. It induces a high airflowresistant when the air is passing through it. When an air purifierintegrated with HEPA filter, a fan with motor of relative large torqueis usually needed in order to compensate the high airflow resistant thatinduced. It is not a environmental friendly method as more energy needto be consumed.

The air resistance induced by the electrostatic dust removal orparticulate precipitation methods with the high-voltage component isusually low. To further improve the performance and efficiency of dustremoval by a high-voltage component, higher operation voltage is usuallyemployed. Though the operation current of the high-voltage is usuallylow, increasing of the operation voltage of the high-voltage componentwill lead to a high power consumption, which is not environmentalfriendly. In the past, many inventions disclosed special circuit designfor the purpose to improve the performance of the high-voltage componentfor the electrostatic precipitation. Increase the operation voltage ofthe high-voltage component or decrease the distance between the positiveand negative components of the electrostatic precipitator can generallyhelp to improve the performance and efficiency of the dust removal.However, harmful ozone may be released as a side-product by thesemethods. On another hand, more strict regulations and requirements areimposed on the air purifier where high-voltage electrostaticprecipitator for the safety concerns, which as a result, lower theflexibility and freedom on the design for the air purifier or airpurification system. It is therefore difficult for designer of airpurifier product to made the volume of air purifier small and compact.

Chinese utility model ZL200820120906.7 discloses an air purifier withhigh-voltage electrostatic precipitation component, where needle-shapecharger is passing through the cylindrical electrostatic hollowcollectors is disclosed. The invention reveals a one dimension,unidirectional and forwarding airflow path design. In order to increasethe efficiency, very long cylindrical electrostatic hollow collectorsare needed. Nevertheless, when the long cylindrical electrostatic hollowcollectors occupied fully with dirty dust and particulates after used,the user would find the maintenance works become very annoyed and notconvenience. The need of long cylindrical electrostatic hollowcollectors would also lower the flexibility on air purifier design.

French patent FR 2623424 (A1) discloses that downstream of an ionizationmean, a metal device for trapping the ionized particles by anelectrostatic effect is installed. The metal device is curvature inshape and it is in perpendicular with the direction of the airflow. Theairflow paths are allowed to be changed within a 2 dimensional planarorientation when come across the metal device, and hence the dustremoval efficiency is therefore improved. Nevertheless, the process offabrication of the metal device into this particular curvature shapeduring manufacturing is costly and complicated. Same as the mentionedChinese utility model (Utility Patent No.: ZL200820120906.7), themaintenances works by the user after used are inconvenience as there aretoo many hidden curvature surface within the dust collector.

SUMMARY OF THE INVENTION

To solve the shortcoming present in the conventional air purificationmethod, the present invention provides an innovative and new method anddevice for separate purifying the particulates from the air and/or thefluid. The said method and device is particularly suitable andapplicable in air purification system. The present invention and devicehaving the distinguishable features of (1) inducing low air flowresistance toward the whole air purifying system during particulatesfiltration, removal, precipitation, and reduction ; (2) allows theprecipitation of the particulates by the method of electrostatic to beoperate with a high-voltage component and circuit, whereas the powerconsumption and the operation voltage of this said high-voltagecomponent are at lower values when comparing to that of the conventionalelectrostatic precipitator for particulates of the same dimension. Sameor even better performance and effectiveness on particulates removal canbe obtained by the present invention; (3) allows the precipitation ofthe particulates by the method of electrostatic to be operate at a lowerairflow rate when compare to that of the conventional electrostaticprecipitator for particulates of the same dimension; and the same oreven shorter time would be needed to achieve the pollutant levelreduction in the area being concerned. Due to the mentioneddistinguishable features, a blower or exhaust fan with motor of lowtorque can be adopted in the air purification system. Hence, the noiselevel of the air purification system can also be reduced. As loweroperation voltage is allowed in order to achieve the same particulateremoval performance as that of the device with the same productdimension, as a result, the safety requirement on the length of thecreepage distance for the air purifier of this type can be shortened.The shortened creepage distance means a more compact and higherflexibility on the product and system design are allowed. The presentinvention also makes the maintenance works of the electrostaticprecipitator for particulates easy to be handled, when compare to theconventional one.

In the first preferred aspect, there is providing an air purificationdevice/system, comprising a casing, at least one air inlet, at least oneair outlet, and a device of electrostatic precipitator for collectingthe particulates from air stream;

the said electrostatic precipitator further comprises at least onepositively charged terminal and one negatively charged terminal; thesaid electrostatic precipitator is located between the said air inletand air outlet; when the air flow from the upstream to the downstream ofthe air purification system, it pass through the said electrostaticprecipitator, wherein the path of the said airflow changed twice withinthe electrostatic precipitator in the way that:

-   -   first, relative to the original airflow which is of a forward        direction, the direction of the airflow is changed within a        planar orientation or within a horizontal surface, by changing        the x-axis—the y-axis coordinate of the airflow in an x-y plane;        in another word, the direction of airflow is changed in the left        and right and/or in the front and back direction;    -   second, relative to the above mentioned x-y planar orientation,        the airflow path changed subsequence at least once in a vertical        (up and down) direction, by changing its co-ordinates in the x        and z axis and/or in the y and z axis.

The particulate matter in the air are removed and being collected by oneterminal of the electrostatic precipitator.

When the positively charged component of the electrostatic precipitatoris arranged as a long passage, and when the negatively chargedparticulates is passing through this long passage, the negativelycharged particulates will be attracted toward the surface of thepositively charged component, whereas it in a parabolic traveling path(as indicated in FIG. 1). The path is based on the mass-charge ratio ofthe charged particulates. If the particulates, after passing this longpassage, and still not be attracted and attached onto the positivelycharged component, it would probably due to the following reason(s):

-   -   (a) The length of the passage of the positively charged        component is too short;    -   (b) The air flow rate is too fast, and so as the velocity of the        negatively charged particulates;    -   (c) The voltages different of the positively charged component        and the negatively charged components is not high enough, as a        result, the particulates matter do not carried enough negatively        charges for being attract to the positively charged component,        or the positively charged component does not have enough        affinity to attract the negatively charged particulates;    -   (d) The weight of the negatively charged particulates matter is        too heavy, and the momentum of the forwarding velocity is too        high, the positively charged component does not have enough        gravitational and or attraction force to change the direction of        the path of the negatively charged particulates.

To enhance the effectiveness of the particulates precipitation and toprevent the causes of the problem as mentioned above, the followingdesigns could be adopted.

(1) To increase the length of the passage of the positively chargedcomponent for the air (or negatively charged particulates) to passingthrough it

(2) To decrease the velocity of the air flow within the positivelycharged component

(3) To increase the operation voltage difference between the positivelycharged and negatively charged components.

As (3) increasing the operation voltage different between the positivelycharged component and negatively charged components will further lead toharsher product requirement in order to meet the safety regulation forhigh-voltage components, it would not be considered as an effective wayto solve the shortcoming of the conventional method. In opposite, theimprovement method stated in (1) and (2) of the above become theobjectives for further improve the performance and effectiveness of theparticulates removal by the electrostatic precipitation in the presentinvention.

In the present invention, when the air flows within the electrostaticprecipitator, the direction of the path of the airflow changes at leasttwice. This would increase the length of the passage for the chargedparticulates when the air stream through it. It can also further lead tothe following positive effect:

-   -   (1) every time when the direction of the airflow path changes,        the velocity of the airflow, as well as the particulates in the        air stream become lowered. The 3-dimensional velocities and        3-dimensional momentum of the negatively charged particulates        thus, is reduced. The said 3-dimensional velocities are        referring to (i) the forwarding velocity of the negatively        charged particulates; (ii) the 3-dimensional self spinning        velocity; (iii) and the 3-dimensional revolute velocity. The        3-dimensional momentum is referring to the energy aroused by the        3-dimensional velocities. As the momentum of the negatively        charged particulates is lowered, the negatively charged        particulates become more easily to be attracted to the surface        of the positively charge component. FIG. 1 indicated the        different way of motion of the negatively charged particulates        in the air stream: (i) traveling forward; (ii) self-spinning        and (iii) in a revolution manner against an external axis.    -   (2) During the first changing of the direction of the airflow        (i.e, airflow is changed within a planar orientation or within a        horizontal surface, by changing the x-axis—the y-axis coordinate        of the airflow path in an x-y plane), partial or total of the        negatively charged particulates would have their the        translational velocity being slowed down, after bombarded on        some obstacle object. Some of the negatively charged        particulates may even become self-spinning against it central        axis or turning around in a rotational manner against an        external axis. The said obstacle object includes (a) those        negatively charged particulates, where they were slowed down        already but not yet been attracted to the positively charge        component; (b) the turbulent airflow, which was created after        the airflow bombarded on the surface of the positively charged        component. The lowering of the translational velocity of the        negatively charged particulate would enhance the changes of        their attraction toward the surface of the positively charged        component.    -   (3) By the law of inertia, the particulates are always tending        to move forward following the air stream, without an external        un-balance force. When a positively charged component with a        bend in shape (or the positively charged component is not a        planar object; or the positively charged component is a        3-dimensional orientated object) is utilized and when the        direction of the airflow path is forced and is guided to change        due to the said bending shape or orientations of the positively        charge component or its structures, the negatively charged        particulates would then bombard on and be attracted and attached        on the surface of the positively charged component.    -   (4) The air inlet is in a upper position when compare to that of        the air outlet. Every time when the direction of the airflow        path is force to change in a vertical position (changing the x        and z coordinates or y and z coordinates against the x-z plane        or y-z plane of the airflow path), the potential energy of the        negatively charged particle would be consumed. The consumption        of the energy of the negatively charged particulate, again,        enhance their attraction toward the postively charge component.

In order to prevent “short-circuit” of the airflow path, i.e., toprevent the cleaned air being drawn from air-outlet immediately tore-enter to the electrostatic precipitator through the nearby air-inlet,the said air inlet and air outlet are preferred be arranged in thefollowing aspect: when the air-outlet and air-inlet of the electrostaticprecipitator are closed and next to each other, relative to the airflowpath and orientation at the air inlet, the airflow path and orientationof the air outlet has an angle of at least 30° against that of the airinlet.

The air and fluid which are to be cleaned includes any those from therespirable suspended particulate matter, particulate matter of anysizes, PM10 (particulate matter of size in 10 micron), PM2.5(particulate matter of size in 2.5 micron), the smoke generated from aburning cigarette, environmental tobacco smoke, and airborne bacteria.

While changing the direction of the airflow path twice within an airpurification device/system, the changed of the said directions in factare guided by the shape, orientation, alignment and arrangement of theof the positively charged components where the airflow stream within it.

The said air purification device/system, further comprise at least onefiltration component other than the said high-voltage electrostaticprecipitator, for purifying and/or filtering the particle phase andgases phase pollutants. The said filtration component can be installedupstream, downstream or even in the same level in series with the saidhigh-voltage electrostatic precipitator. The said filtration componentcomprises at least one of the follows:

-   -   (a) pre-filter for filter the large size particle;    -   (b) pellet form of activated carbon materials, photo catalytic        materials or molecular sieve materials, and/or pellet mixtures        of any of the above mentioned materials; the pellet materials        are put in a container which is permeable for air to pass        through it; the materials are acting as carrier for gases phase        pollutants during filtration;    -   (c) materials attached with activated carbon, photo-catalyst or        molecular sieve, and/or mixtures of any of the above mentioned        materials; the said materials is permeable for air to pass        through it and can remove the gases phase pollutants during the        filtration;    -   (d) honeycomb structure where it contains the materials of        activated carbon, photo-catalyst or molecular sieve, and/or        mixtures of any of the above mentioned materials;    -   (e) High-Efficiency Particulate Arresting filter (HEPA filter);    -   (f) Germicidal section by mean of Ultra-Violet light

The air purification device/system further comprises a device and/ormethod for driving the airflow stream from upstream to the downstream.The said device for driving the airflow stream from upstream to thedownstream can be any or the combination of a fan, a blower, or airre-circulation devices. The said method for driving the airflow streamfrom upstream to the downstream comprises connecting the said airpurification device/system to an environmental device, which theenvironmental device is equipped with a fan or a blower. The way ofconnection can be performed by connecting partial or all of the airinlet and/or air outlet of the air purification device/system to the airinlet and/or air outlet of the said environmental device.

The air purification device/system comprise further at least one exhaustfan which is installed at the downstream position of the airpurification device/system.

The air purification device/system comprise further at least one blowerwhich is installed at the upstream position of the air purificationdevice/system.

The air purification system comprise a high-voltage electrostaticprecipitator, wherein the electrostatic precipitator is 2-dimensionalplanar metallic or conductive object which is positively charged; the2-dimensional planar object is a plain surface or a surface with up anddown waveform shape for increasing the total surface area for dustcollection. The 2-dimensional planar object is connected to the positivevoltage terminal. The 2-dimensional planer object fabricated by metalmaterials or any materials that is electrically conductive. More thanone 2-dimensional planar object is connected together by connectingcomponent (e.g, connecting component in U-shape) and formed a3-dimensional object. The direction of the airflow path changed at leasttwice when it is streamed within the 3-dimensional object. Theconnecting component is preferred to be made of metal or conductivematerials.

The high-voltage electrostatic precipitator comprises a negativelycharged component with the following features:

-   -   (a) The negatively charged component comprises metal needle(s)        or conductive materials which are in needle shaped and being        connected to the negative voltage terminal;    -   (b) The negatively charged component comprises metal wire(s) or        conductive materials which are in wire shaped and being        connected to the negative voltage terminal;    -   (c) The negatively charged component comprises metal net (s) or        conductive materials which are in net shaped and being connected        to the negative voltage terminal;    -   (d) The negatively charged component comprises at least two of        the any above mentioned features.

The air purification device/system further comprises a high-voltageelectrostatic precipitator, wherein the positively charged componentsare equipped at the downstream position of the negatively chargedcomponents.

The air purification device/system further comprises a high-voltageelectrostatic precipitator, wherein the positively charged componentsare aligned parallel to the negatively charged components, and alsoparallel to the direction of the airflow path.

The air purification device/system further comprises a high-voltageelectrostatic precipitator, wherein the positively charged componentsare interlaced parallel to the negatively charged components in a singleor multiple “sandwiching” manners. As the airflow is passing though aparalleled positively charged passage which is of even thickness, highfrequent noise which induced by the cyclone style electrostaticprecipitator will not be generated.

The air purification device/system further comprises a high-voltageelectrostatic precipitator, wherein the positively charged componentsare replaced by:

-   -   (a) a neutral charged component;    -   (b) another negatively charged component but with relatively        lower voltage value, when compared to the negatively charged        components of the original electrostatic precipitator.

The present invention further comprises a method for air purification,which are implemented by any of the above mentioned technique.

The air purification system/device present in the present invention canalso be interpreted as a standalone electrostatic precipitator unitwhich is applicable to be installed in any different type of airpurification device/system/system. The air inlet refers to the air inletof the standalone electrostatic precipitator unit, whereas the airoutlet refers to the air outlet of the standalone electrostaticprecipitator unit.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 illustrated the airflow of the negatively charged particulates istraveling in a direction of parabolic curve manner, three dimensionalself-spinning manner, and three dimensional rotational manner.

FIG. 2 illustrated the internal structure of the high-voltageelectrostatic precipitator of in the present invention.

FIG. 3 illustrated the outlook of the positively charge components forparticulates collection

FIG. 4 illustrated when the air inlet and air outlet of the high-voltageelectrostatic precipitator is in neighborhood with each other, theorientation and angle separation between for airflow them shall morethan 30°.

FIG. 5 illustrated comparison on the performance of the particulatesremoval on (1) a high-voltage electrostatic precipitator device wherethe direction of the airflow path changes at least twice as mentioned inthe present invention; (2) a high-voltage electrostatic precipitatorwhere the direction of the airflow path changes once only.

DETAILS DESCRIPTION OF THE DRAWING

FIG. 1 indicates the particulates pollutants 101 flows via an airflow401 traveling in a forward direction. When the airflow passes throughthe negatively charged components, the particulate pollutants will becharged up and become the negatively charged particulates 102. Onpassing through the passage of the positively charged component 300 ofthe electrostatic precipitator, the negatively charged particulates 102will travel according to a parabolic curve and be attached to thesurface of the positively charged component 300 according the mass tocharge ratio of them. Besides the traveling in a forwarding direction202 with a translational velocity, the negatively charged particulatesalso moving in with the direction which is rotating in a turning aroundmanner 203, self-spinning manner against the x-y axis 204 a,self-spinning manner against the z-y axis 204 b, self-spinning manneragainst the x-z axis 204 c. When the airflow 401 is passing through thepositively charged component of the electrostatic precipitator, thedirection of the airflow 401 path changes at least twice, wherein, thevelocities of the different rotating and self-spinnings 203, 204 a, 204b, 204 c are lowered. As a result, the total momentum of the negativelycharged particulates 102 is reduced. The negatively charged particulates102 become easily be attracted and attached on the surface of thesurface of the positively charged component 300.

In one embodiment, when the direction of the airflow path change (i.e.,the direction of the airflow path is changing planar in a x-y axissurface), partial or total negatively charged particulates 102 bombardedon the obstacle object and have their translational velocity 202 (whichis in a forward direction) be slowed down. Some of the translationalvelocity 202 will transformed to angular velocities 203 & 204 a, 204 b,204 c as the particulates matter become spinning and turned around afterbombard on the obstacle object. As the translational velocity 202 of thenegatively charged particulates 102 is lowered, it is then more easilyto be attracted and be attach on the surface of the positively chargecomponents. Upon changing the direction of the airflow again in avertical (up and down) manner (direction relative to the original x-yplanar orientation), the original translation velocity and angularvelocities 203 & 204 a, 204 b, 204 c will further be slowed down. Theoriginal spinning and rotation directions will change to other ways ofspinning and rotation. All these changed the velocities of thenegatively charged particles and make it become more easily to be caughtby the positively charged component during the electrostaticprecipitation.

FIG. 2 indicates in another embodiment, the structure of thehigh-voltage electrostatic precipitator for air purification system ispresented. Four planar metal plate or conductive materials 300 withshape as shown are put together in an overlapping manner into a threedimensional volume. The layers are in sequence of 300A-300B-300C-300D.Each layer is separated with 15 mm distance apart. One end of the firstlayer metal plate 300A and one end of the third layer metal plate 300Care connected together by a U-shaped connecting component 310. Anotherend of the second layer metal plate 300B and another end of the fourthlayer metal plate 300D are connected together by another U-shapedconnecting component 320. In between each layer of the planar metalplate or conductive materials, the negatively charged components areinterlaced in a parallel manner, wherein, the distance between the upperlayer metal plate and the negatively charged component are equal to thatbetween the lower layer metal plate and the negatively chargedcomponent, in order to prevent the localized voltage breakdown, whichwould otherwise induce sparks during the high voltage operation. Thesaid negatively charged component comprises the conductive wires whichare in connection with the negative voltage terminal (while in otherembodiment, the conductive net or needle object might be used as thenegatively charged component). In the present embodiment, the voltagevalue is adjustable according to need during operation. It can beadjusted between 2K volt to 6K volt. The airflow is then steam withinthe high-voltage electrostatic precipitator as the following path:

-   -   (1) The uncleaned airflow 401 from the environment enter the        high-voltage electrostatic precipiator through the air inlet        303, it flows in between the metal plate layers 330A and 300B.        The negatively charged particulates within the airflow 401 is        then be attracted and attached on the surface of the positively        charged component. When flowing within the spacing between the        metal plate layers 300A and 300B, the direction of the airflow        path changed once, which is planar manner 402, i.e., the        cooridinates of x-axis and y-axis of the airflow path changed.    -   (2) When airflow flow to the U-shaped connecting component 310,        the direction of the airflow path changes again 403. The        direction of the airflow path is changing vertically between a        upper and lower locations, i.e., the cooridinates in x-z axis        and y-z axis of the airflow path changed 403.    -   (1) When the airflow turn to stream between the second 300B and        third 300C positvely charged metal layers, the direction of the        airflow path changed once again, which is in a planar manner        404;    -   (4) When airflow flow to the U-shaped connecting component 320,        which connecting another end of the second 300B and forth 300D        layer of the positively charged component, the direction of the        airflow path changes the forth time. The direction of the        airflow path is changing vertically between a upper and lower        locations, i.e., the cooridinates in x-z axis and y-z axis of        the airflow path changed 405;    -   (5) When the airflow turn to stream between the third 300C and        forth 300D positvely charged metal layers, the direction of the        airflow path changed once again, which is in a planar manner        406;    -   (6) Finally, the cleaned airflow 407 exist the 3-dimension        volume of the postively charge componet 304 and be exhausted.

If U-shaped connecting component is made of metal or or other conducitvematerials, the performance will be come even more significant.

In the present embodiment, the air inlet 303 of the high-voltageelectrostatic precipitator is located at a higher position in compare tothe air outlet 304. In opposite, if their position is reverse in a waythat if the air inlet 303 is located at a lower position than the airoutlet 304, then the potential energy of the negatively chargedparticulate will further be consumed when the airflow path is turning upeach time when it mean the U-shaped connecting component. Theparticluate removal performance by the high-voltage electrostaticprecipitator can further be enhanced.

FIG. 3 indicated the morphology of the positively charged componentwhich is connecting to the positive voltage terminal of the high-voltageelectrostatic precipitator. The positively charged component isfabricated with conductive materials or metal with up and down waveformsurface 301. The waveform morphology greatly increases the area for dustcollection. The shape of the waveform shall be parallel with the airflowpath. The waveform can also be turned or bended according to the outlookof the positively charged component as shown.

FIG. 4 indicated the when the air inlet 303 and air outlet 304 of thehigh voltage electrostatic precipitator 501 is in neighborhood with eachother, the angle and orientation of the airflow path 407 of from the airoutlet 304 and that from the air inlet 303 shall be greater than 30°.This is to prevent the short-circuit 901 of the airflow. Morespecifically, this prevent the cleaned air exhaust from the outletimmediately be drawn into the air-inlet where the un-cleaned air fromthe environment cannot approached to the air-inlet due to the airflowshort-circuit.

FIG. 5 illustrated comparison on the performance of the particulatesremoval on (1) a high-voltage electrostatic precipitator device wherethe direction of the airflow path changes at least twice as mentioned inthe present invention 501; (2) a high-voltage electrostatic precipitatorwhere the direction of the airflow path changes once only 502. Thehigh-voltage electrostatic precipitator 502 does not contain anyU-shaped connecting component at each end as the embodiment explained inFIG. 2. The high-voltage electrostatic precipitator 501 has a longerpassage for negatively charged particulate in comparing to thehigh-voltage electrostatic precipitator 502. When the two high-voltageelectrostatic precipitator are put into two air purification system withsame parameters (same airflow rate and same operating voltage for theelectrostatic precipitator), they can performed differently. Forexample, when they are put into two room of size 1 m×2 m×4 m where thepollutant PM10 was in a level of 500 □g/m³, the high-voltageelectrostatic precipitator 501 is capable to reduce the pollutant levelto 25 □g/m³, where the electrostatic precipitator 502 can only reduce itup to 160 □g/m³. The present invention can help to enhance the removalefficiency for particulate matter. In other word, it can help toincrease the Clean Air Delivery Rate (CADR) under the same airflow rate.Similar performance are also found if the study is substituted withparticulate matter of size 2.5 micron (PM2.5), pollen, smoke generatedfrom cigarette and the environmental tobacco smoke.

It will be appreciated by person skilled in the art that numerousvariation and/or modification may be made to the invention as shown inthe specific embodiments without departing from the scope or spirit ofthe invention as broadly described. The present embodiment, aretherefore, to be considered in respects illustrative and notrestrictive.

1) An air purification system, comprising: a casing; at least one airinlet; at least one air outlet defined in the casing; at least onehigh-voltage electrostatic precipitator housed within the casingpositioned between the air inlet and air outlet; wherein air flows froman upstream position to a downstream position between the air inlet andair outlet of the air purification system via the electrostaticprecipitator; and the direction of the air flow path changes at leasttwice within the electrostatic precipitator, and particulate mattercontained the air is collected by a component of the electrostaticprecipitator. 2) The system according to claim 1, wherein theelectrostatic precipitator further comprises at least one positivelycharged component and one negatively charged component which areconnected to the positive voltage terminal and negative voltage terminalrespectively; 3) The system according to claim 1, wherein, the directionof the path of the airflow changes at least twice according to: (a)relative to the airflow which is of a forward direction, the directionof the airflow changes within a horizontal planar orientation, where thex-axis - the y-axis coordinates of the airflow in an x-y plane surfacechanges; (b) second, relative to the x-y planar surface mentioned in(a), the airflow path changes in a vertical (up and down) direction,where the x and z axis and/or the y and z axis coordinates of theairflow changes. 4) The system according to claim 1, wherein theposition of air outlet is located at a lower altitude position incomparison to that of the air inlet. 5) The system according to claim 1,wherein the change of the direction of the air flow path is guided bythe orientation and shape of the internal structure of the positivelycharged components of the high-voltage electrostatic precipitator. 6)The system according to claim 1, further comprising at least onefiltration component for further purifying and/or filtering the particlephase and gases phase pollutants; the filtration component either beinstalled upstream, downstream or in the same level in a series mannerwith the high-voltage electrostatic precipitator. 7) The systemaccording to claim 1, further comprising any one from the groupconsisting of: a blower, a exhaust fan, and an air-recirculation device,for driving the airflow stream from upstream to the downstream. 8) Thesystem according to claim 1, wherein the system is connected to anenvironmental device which is equipped with a fan or a blower; and atleast partially the air inlet and/or air outlet is connected to the airinlet and/or air outlet of the environmental device. 9) The systemaccording to claim 1, wherein the high-voltage electrostaticprecipitator further comprises at least one positively charge2-dimensional metallic or conductive planar object; the 2-dimensionalplanar object is any of a plain surface or a surface which made up withup and down waveform-shaped morphology for increasing the total surfacearea for dust collection. 10) The system according to claim 9, whereinat least two 2-dimensional metallic or conductive planar objects areconnected together by at least one connecting component into a3-dimensional metallic or conductive object. 11) The system according toclaim 10, wherein the connecting component are metallic or conductivematerials. 12) The system according to claim 2, wherein the negativelycharged component is any one from the group consisting of: (a) anegatively charged component comprises metal needle(s) or conductivematerials which are in needle shaped and being connected to the negativevoltage terminal; (b) a negatively charged component comprises metalwire(s) or conductive materials which are in wire shaped and beingconnected to the negative voltage terminal; (c) a negatively chargedcomponent comprises metal net(s) or conductive materials which are innet shaped and being connected to the negative voltage terminal; and (d)a negatively charged component comprises at least two of the any abovementioned features. 13) The system according to claim 2, wherein thepositively charged components of the high-voltage electrostaticprecipitator is located at a downstream position of the negativelycharged components. 14) The system according to claim 2, wherein thepositively charged components are aligned parallel to the negativelycharged components. 15) The system according to claim 2, wherein the atleast one positively charged component is interlaced parallel to thenegatively charged components in a single or multiple sandwichingmanner. 16) The system according to claim 1, wherein the airflow pathand orientation of the air outlet has an angle of at least 30° againstthat of the air inlet. 17) The system according to claim 2, wherein thepositively charged components are replaced by: (a) a neutral chargedcomponent; or (b) a negatively charged component with a lower voltagevalue compared to the negatively charged components of the electrostaticprecipitator.